Circuit Breaker & Switchgear Testing: Verifying low-resistance contacts in HV/MV/LV switchgear.
Power Transformer & Busbar Inspection: Measuring connection integrity in substations.
Cable & Conductor Joint Validation: Ensuring minimal resistance at splices and terminations.
Rail & Welding Quality Control: Assessing resistance of welded joints in industrial applications.
Preventive Maintenance & Commissioning: Essential for acceptance testing and routine diagnostics in power plants, grids, and industrial facilities.
KDZD300A cable outer sheath loop current grounding tester is applicable to the following specific measurement scenarios:
Detection of substation cable grounding system
Measure the circulating current of the metal sheath of high-voltage cable (such as aluminum sheath and copper shielding layer) in the single-end or cross interconnection grounding mode, and judge whether there are multipoint grounding, insulation damage or poor grounding faults.
Plant service power and transmission cable monitoring
Regular patrol inspection shall be carried out for the grounding current of the outer sheath of the power cable at the outlet of the generator, the low voltage side of the main transformer and the plant power distribution system to prevent cable overheating, insulation aging and other problems caused by large loop flow.
Operation and maintenance of urban underground cable tunnel/pipe gallery
Quickly detect the outer sheath grounding current and harmonic components of densely laid cables without interrupting the power supply, and evaluate cable operation and grounding system integrity.
Cable line fault diagnosis and preventive test
By measuring the circulating current, harmonic content (maximum 25 times), total harmonic distortion rate (THD) and other parameters, it can help judge the insulation deterioration of cable sheath, abnormal induced voltage or abnormal grounding circuit.
Analysis of harmonic interference
In places with nonlinear load (such as frequency converter and rectifier equipment), detect harmonic and inter-harmonic current in cable grounding circuit and evaluate its impact on system safety.
Leakage current and frequency monitoring
It is used to troubleshoot the leakage current to the ground caused by the damage of cable outer sheath, and monitor the system frequency stability (20Hz~400Hz wide frequency range, power frequency 45~65Hz high accuracy).
With non-contact, high anti-interference, portable and durable characteristics, the equipment is especially suitable for power operation and maintenance personnel to carry out fast, safe and accurate live detection and state evaluation on site.
The complete set of test equipment for KDCJ-1800kV/180kJ impulse voltage generator is suitable for the following specific test scenarios:
1. High voltage insulator impact withstand voltage test
Conduct lightning impulse full wave (1.2/50 μ s) and operational impulse (250/2500 μ s) withstand tests on ceramic insulators, composite insulators, etc. to verify their insulation performance under overvoltage, in compliance with JB/T 7616 and DL/T 557 standards.
2. Impact test for bushings (such as transformer bushings and wall bushings)
Simulate the impact of lightning or overvoltage on the external insulation and internal structure of the casing, and evaluate whether flashover or breakdown will occur.
3. Impulse test of current/voltage transformers
According to the requirements of GB/T 7449, conduct lightning impulse test on the transformer to verify the reliability of its main insulation and inter turn insulation.
4. Type testing of power transformers and reactors
During the research and development or manufacturing stage, conduct lightning impulse tests on large transformers to verify the insulation strength of windings to ground and between phases.
5. Verification of GIS (gas insulated switchgear) and high-voltage switch components
Perform impulse voltage tests on insulation supports, isolation fractures, and other components in GIS to ensure safe operation under extreme overvoltage conditions.
6. Standard tests of scientific research and certification testing institutions
Used for conducting authoritative testing in high-voltage laboratories that comply with national standards such as GB/T 16927 and GB/T 311, supporting product type testing, sampling, or international certification (such as IEC benchmarking).
✅ This equipment is particularly suitable for use in indoor high-voltage testing halls, and can operate continuously to meet the full chain high-voltage testing needs from product development, factory quality inspection to third-party certification.
